Just unwrapped at Geneva is this extraordinary Porsche 918 Spyder concept car, a mid-engined two-seater combining supercar performance with just 70 grams CO2 per kilometre emissions and a fuel consumption of 3.0 litres/100 kilometres (94 mpg imp). Under those curvaceous lines hides a 500 bhp V8 plus three electric motors totalling 215 bhp offering a wickedly fast 0-100 km/h time of 3.2 seconds, a top speed of 320 km/h (198 mph) and it's already done a lap of the Nordschleife Nurburgring circuit under 7:30 minutes, which is faster than even the Porsche Carrera GT. Buyers will be queued up around the block if (or more likely, when) this goes into production.